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By Atanasov D.V.

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Extra resources for 5th International Conference on Geometry and Applications

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The - source is 180° out of p h a s e . If a signal is applied to both inputs, the output will be z e r o . This property is called c o m m o n - m o d e rejection. Since an o p a m p can h a v e very high gain at low frequencies (100,000 is typical), a high c o m m o n - m o d e rejection ratio p r e v e n t s amplification of u n w a n t e d noise, such as the ubiquitous 60-Hz power-line frequency. Most op a m p s are p o w e r e d by dual, symmetrical supply voltages, + V and - V relative to g r o u n d , w h e r e V is typically in the range of 5 to 15 volts.

Amplitude modulation is easily achieved using an analog multiplier. A simple m e a n s of producing an analog multiplier is s h o w n in Figure 3-21. T h e t w o inputs each pass through a log amplifier and then are added together; finally, they pass through an antilog amplifier. T h e output voltage is equal to the product of the input voltages times a scaling factor. Analog multipliers are commonly available as single-chip d e v i c e s . T h e r e are m a n y o t h e r standard analog signal conditioning circuits besides the o n e s s h o w n h e r e .

This result of aliasing is the difference frequency b e t w e e n the sampling rate and signal frequency, which is (4/3 - 1) x / 0 . If the sampling rate w a s equal to the signal frequency, the digitized waveform would be a c o n s t a n t value. In general, an A D C ' s sampling rate should be much higher than twice the m a x i m u m signal frequency. A value of five times is a good choice. In most data acquisition s y s t e m s , the analog input is filtered to eliminate any signal c o m p o n e n t s a b o v e the Nyquist frequency.

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5th International Conference on Geometry and Applications by Atanasov D.V.


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